Door-knob attachment



(Modem ,G.'E. STELLER DOOR KNOB ATTACHMENT.

No. 410,216. Patented Sept. 3, 1889.

UNITED STATES PATENT a OFFICE.

cHARLEs E. STELLER, or MILWAUKEE, WISCONSIN.

DOOR-KNOBATTACHMENT.

SIEEGIFICATION forming part of Letters Patent N 0. 410,216, dated September 3, 18 89.

Application filed April 8, 1889.

To all whom it may concern: a

Be it known that 1, CHARLES E. STELLER, of Milwaukee, in the county of Milwaukee and State of \Visconsin, have invented new and useful Improvements in Door-Knob Attachments; and I do herebydeclare the following to be a full, clear, and; exact description of said invention, reference being had to the accompanying drawings, and to the letters or figures of reference marked thereon, which form a part of this specification.

. My invention relates to improvement-sin door-knob attachments; and it pertains more especially to the peculiar construction of the device by which the knob-shank is secured to the spindle, and the construction of my improvement is explained by reference to the? accompanying drawings, in which- Figure 1 represents a perspectiveview of my device attached to a door. Fig. 2is a longitudinal vertical section through the knob and shank showing therein a side View of the spindle and the cam-lever by which it is connected with the shank. Fig. 3 is a rear View of the knob and retaining-plate with the rose removed.

' Like parts are represented by the same ref erence-letters throughout the several views.

A A are door-knobs, which are secured to the respective sides of the door B upon the respective ends of the spindle O.

D is an ordinary rose, which is used to cover up from view the fastening device and give it a finished appearance. The fastening device consists in a cam-leverE, which is pivoted eccentrically to the end of the shank F upon the pivot or screw G, which pivot or screw G passes through an aperture formed therefor in said cam-lever E, and is rigidly affixed at its inner end to the end of the shank F. A series of notches I I are formed in the surface of the spindle 0, preferably at one of its corners, for the reception of the camlever E. The eccentric bearing of the camlever is so formedas when in the closed position to be brought directly in line between one of the notches I and the retaining-pivot G, whereby such eccentric bearing of said cam-lever E acts as a wed gebetween the pivot G and one of the retaining-notches I, and consequently as said cam-lever E is turned downward from the vertical position shown in Fig. 3 against the spindle, as indicated by dotted lines in said figure, the eccentric bearmg of said cam-lever acts as a wedge and Serial No. 306,392. (ModeL) y presses with great force against said spindle,

whereby said spindle is held rigidly in place in its retaining-socket within the shank F, and all tendency to rattle or shake upon the spindle is thereby obviated, and the cam-1ever is retained rigidly in place in its locking position by reason of its intense pressure against the side of said spindle, whereby the shank is more rigidly secured to the spindle than by thelocking devices as heretofore constructed, and all liability of the knobshank becoming disengaged is thereby obvi:

ated. To provide for attaching the cam-lever E to shanks of small diameter, an upward projecting fiange II is formed integral with said shank for the reception of the pivot G."

The swinging arm of the cam lever E is so shaped that when engaging in one of the the periphery of the'shank or retaining-ll ange until its retaining'edge is disengaged from the spindle, as shown in Fig. 3. It is obvious that as the eccentric bearing-surface of said,

cam-lever engages in the'retaining-notch directly in line between said notch and the re; taining pivot any strain brought to bear upon said spindle has no tendency whatever to turn said eccentric upon its supporting-pivot. A thin washer is preferably located betweenthe end of the pivot G and the door to prevent the surface of the door from becoming worn by contact with the fastening. Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

In a door-knob attachment, the combination, with the knob-shank F and spindle 0, provided with a series of retaining-notches I, of the cam-lever E, pivoted eccentricallyto said shank F, the eccentricbearing of said cam-lever being located between the cam-supporting pivot and the retaining-notches of said spindle, and adapted to engage in one of the notches of and act asa wedge between the retaining-pivot and said spindle, substantially as and for the purpose specified.

In testimony whereof I aflix my signature in presence of two witnesses.

CHARLES E. STELLER. Witnesses:

JAs. B. ERWIN, I ANNA FAUST. 

